基本成型法裁弯设计

Basic formed method for river cut off design

本文根据曹娥江五甲渡裁弯工程设计实践，通过实测资料分析与数学模型计算的有机结合，提出了一种新的蜿蜓性河道人工裁弯方法———基本成型法．主槽与防洪堤基本成型，新河部分土方人工开挖，其余部分借助水力自然冲刷，使得工程一气呵成的同时，工程量也显著降低，并能最快发挥效益．文章重点阐述了裁弯新河的设计方法，分析了其适用条件．按这一方法设计的上述工程已经开工．

Combining the field data analysis with the mathematical model, this paper proposes a new construction method of river cut off for meandering river which named as the basic formed method. By using this method, the main channel and flood protection embankment are basically formed during construction. Most earthwork of the new channel are excavated artificially and the rest will be scoured by river flow. Thus, the amount of excavation of the cut off work can be significantly reduced and the construction can be speed up.